There are a couple of books on the topic...
For example Super "T" by Karlis Ullis et al., and Natural Hormonal Enhancement by Rob Faigin. Or even the "Testosterone Advantage Plan" by Lou Schuler, et al.
And of course the "Anabolic Diet".
For the most part, the advice you're going to get is probably going to be along the lines of eat your fat, eat your protein, avoid sugar, and do heavy compound lifts at the gym.